Composite board.



H. H. ROBERTSON.

COMPOSITE BOARD.

Patented Jan. 21, 1919.

APPLICATION FiLED JULY 28,1916.

pensive.

UNITED STATES PATENT OFFICE.

HAROLD VBI. ROBERTSON, 0F SEWI-CIILEY, PENNSYLVANIA, ASSIGNOR- TO ASBESTOS PROTECTED METAL COMPANY, OF PITTSBURGH, PENNSYLVANIA, A. CORPORATION' OF PENNSYLVANIA.

Specification of Letters Patent.

COMPOSITE BOARD.

Patented J an. 21, 1919.

struction of temporary buildings orl struc-V tures, such as warehouses, construction camps, and also for the walls and roofs of permanent structures, such as garages, portable hospitals, bungalows and other structures. l

The invention has for its object to provide a composite board, which is capable of being made and used of any desired size within limits, which is weather and fire resisting,

which is stii'l' and self-sustainin and can be made of material thickness wlthout correspondingly increasingits weight, which is capable of being sawed and fitted on the job the same as lumber and can be easily punctured by nails, and which is light and inex- A composite board having these characteristics is composed of a non-metallic member in sheet form and of substantial thickness, which is interposed between and adhesively secured to'thinner outside layers or sheets of asbestos paper or felt or like lire-resisting material, one, and in some cases, both of which layers may be provided with an exterior surface coating of iluxed asphalt, and one of which may andpreferably will be saturated with asphalt or like hydrocarbonaceous material.

When the composite board is applied to l l of this specification.

Figure 1 is a perspective view-,of a portion of a composite board embodying this invention, and

material, and may be composed of fibrous material, such as wood pulp, old newspaper stock, or similar inexpensive paper stock, impregnated with a suitable size or stiiener, such as is commercially used as wall board, or it may be of substantially heavy felt, or other light non-metallic material.

The center member a is of material thickness yet light, and the asbestos layers b, o, are relatively thinner and are aiixed to the opposite surfaces of the member a, preferably by means of layers of asphalt, represented by the heavy black lines 10, 12, and the said asbestos layers may also be attached to the center member a by means of layers 13 of asphalt applied to the opposite side 'edges of said layers and center member.

One of the asbestos layers, as, for instance, the layer b, which is to form the exterior layer of the board when the latter is applied to the studs or other part of the building, is preferably saturated 'with asphalt, and the entire board may be provided with a protective layer 15 of asphalt, such as a fluxed asphalt.

In cases where the board is to be left exposed on the interior of the building or other structure, one .of the asbestos layers, as, for instance, c, is left uncovered by the protective layer 15 of asphalt as shown in Fig. 2, and is for the best results provided with a colorless filling or size to provide a surface, which is receptive for paint 4or other decoration;

The non-metallic center member of the composite board is capable of being made of material thickness without a corresponding increase in weight, and can be made of any desired area Within limits, and possesses the desired stiffness to' enable it to be self-sustaining and capable of being handled without inconvenience, and when associated with the other elements of the composite board, there is produced a board, which is not only inexpensive and light, but one which is weather and fire resisting, and capable of being sawed and fitted on the job, and also of having nails driven through it with ease and without the necessity of irst puncturing the center member.

In other words, the composite board 4is available for temporary structures, and also for inexpensive permanent structures.

.I have herein described vone construction of non-metallic composite board, which l may prefer, but it is not desired to limit the invention to' the particular construction shown.

Claims: A

1. A composite board of the character described, comprising a center member of n onmetallic material which is homo eneous throughout its mass, is of substantia thickness yet light and of suitable stiness to render it self-sustaining, and which is capable of being readily punctured by fastening" devices and of being sawed and fitted on the job, layers of asbestos paper or felt adhe sively aiiixed to the opposite surfaces of said center member, and a protective layer of uxed asphalt which is substantially nonadhesive at ordinary temperatures but is rendered adhesive by -heat and which envelops said center member and said asbestos' layers.

2. A composite board of the character dey scribed, comprising a center member of nonmetallic material which is homo encens throughout its mass, is ot substantia thickness yet light and et suitable sti'ness to renmaarre? ness w ich is substantially non-adhesive at ordinary temperatures but is rendered adhesive b heat, and which is a plied to one of said re-resistinelayers an to the sides of said center mem r,

3. A composite board of the character described,'comprising a center member of no'nmetallicy material which is homogeneous throughout its mass, is of substantial thickness yet light and. of suitable stiness to render-it self-sustaining, and which is capable of being readily punctured by fastening devices -and of being sawed and fitted on the job, relatively thin layers of fireresisting material adhesively afxed to said center member and one of which is saturated with asphalt, and a protective layer of Huxed asphalt of substantial thickness which is substantially non-adhesive at ordinary temperatures but isrendered adhesive by heat and which is applied to said saturated tire- .resisting member and to the sides of said center member.

In testimony whereof, l have signed my name to this specilcation.

' HARLD H. ROBERTSN. 

